On my 2006 LSJ I have noticed lately when I’m going a steady speed I get a slight shimmy and my boost gage drops and will stay there. It’s like it doesn’t like being in between vacuum or boost. If I down shift and hammer it I get full boost (12-15psi depending on throttle) I have the ZZP pcm flash, ZZP 3” intake so I get a little more.. but this is bothering me as to why it does this. What could be my issue?

 

Ive been having a boost issue also where I was only getting 2.4# of boost on my 06 lsj. It was the boost bypass solenoid. Unplug that vaccum line and drive normally. if it works normally it’s that or the boost bypass actuator. I would start there before anything.